Ionia Weather Forecast

    • 49
    • 65

    Becoming Sunny

    • 46
    • 71

    Chance Rain Showers

    • 46
    • 61

    Mostly Sunny

    • 50
    • 70

    Partly Sunny

    • 49
    • 68

    Mostly Sunny

    • 50
    • 69

    Partly Sunny

Today 28 May Ontario

Cloudy with scattered Showers late this Morning, then partly sunny this afternoon. Highs Ranging from the upper 50s on the Hilltops to the mid 60s across the lower Elevations. North Winds 5 to 10 Mph, becoming northwest 10 to 15 Mph. Chance of rain 40 percent.

Tonight 28 May Ontario

Mainly clear. Lows in the upper 40s. Northwest Winds 10 Mph or less.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Ionia Temperature Statistics

May Temperature

Rochester, Greater Rochester International Airport (15.5 miles)

  • Lowest 12 May, 2026

    33.7 °F

  • Average May

    55.6 °F

  • Highest 18 May, 2026

    89.7 °F

Climate (2021–Present)

Rochester, Greater Rochester International Airport (15.5 miles)

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  • Average Low 2021–2026

    42.3 °F

  • Average 2021–2026

    50.8 °F

  • Average High 2021–2026

    59.5 °F
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